1/* shell.c -- readline utility functions that are normally provided by
2	      bash when readline is linked as part of the shell. */
3
4/* Copyright (C) 1997 Free Software Foundation, Inc.
5
6   This file is part of the GNU Readline Library, a library for
7   reading lines of text with interactive input and history editing.
8
9   The GNU Readline Library is free software; you can redistribute it
10   and/or modify it under the terms of the GNU General Public License
11   as published by the Free Software Foundation; either version 2, or
12   (at your option) any later version.
13
14   The GNU Readline Library is distributed in the hope that it will be
15   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   The GNU General Public License is often shipped with GNU software, and
20   is generally kept in a file called COPYING or LICENSE.  If you do not
21   have a copy of the license, write to the Free Software Foundation,
22   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23#define READLINE_LIBRARY
24
25#if defined (HAVE_CONFIG_H)
26#  include <config.h>
27#endif
28
29#include <sys/types.h>
30
31#if defined (HAVE_UNISTD_H)
32#  include <unistd.h>
33#endif /* HAVE_UNISTD_H */
34
35#if defined (HAVE_STDLIB_H)
36#  include <stdlib.h>
37#else
38#  include "ansi_stdlib.h"
39#endif /* HAVE_STDLIB_H */
40
41#if defined (HAVE_STRING_H)
42#  include <string.h>
43#else
44#  include <strings.h>
45#endif /* !HAVE_STRING_H */
46
47#if defined (HAVE_LIMITS_H)
48#  include <limits.h>
49#endif
50
51#include <fcntl.h>
52#include <pwd.h>
53
54#include <stdio.h>
55
56#include "rlstdc.h"
57#include "rlshell.h"
58#include "xmalloc.h"
59
60#if !defined (HAVE_GETPW_DECLS)
61extern struct passwd *getpwuid PARAMS((uid_t));
62#endif /* !HAVE_GETPW_DECLS */
63
64#ifndef NULL
65#  define NULL 0
66#endif
67
68#ifndef CHAR_BIT
69#  define CHAR_BIT 8
70#endif
71
72/* Nonzero if the integer type T is signed.  */
73#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
74
75/* Bound on length of the string representing an integer value of type T.
76   Subtract one for the sign bit if T is signed;
77   302 / 1000 is log10 (2) rounded up;
78   add one for integer division truncation;
79   add one more for a minus sign if t is signed.  */
80#define INT_STRLEN_BOUND(t) \
81  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
82   + 1 + TYPE_SIGNED (t))
83
84/* All of these functions are resolved from bash if we are linking readline
85   as part of bash. */
86
87/* Does shell-like quoting using single quotes. */
88char *
89sh_single_quote (string)
90     char *string;
91{
92  register int c;
93  char *result, *r, *s;
94
95  result = (char *)xmalloc (3 + (4 * strlen (string)));
96  r = result;
97  *r++ = '\'';
98
99  for (s = string; s && (c = *s); s++)
100    {
101      *r++ = c;
102
103      if (c == '\'')
104	{
105	  *r++ = '\\';	/* insert escaped single quote */
106	  *r++ = '\'';
107	  *r++ = '\'';	/* start new quoted string */
108	}
109    }
110
111  *r++ = '\'';
112  *r = '\0';
113
114  return (result);
115}
116
117/* Set the environment variables LINES and COLUMNS to lines and cols,
118   respectively. */
119void
120sh_set_lines_and_columns (lines, cols)
121     int lines, cols;
122{
123  char *b;
124
125#if defined (HAVE_PUTENV)
126  if (asprintf (&b, "LINES=%d", lines) == -1)
127	  memory_error_and_abort("asprintf");
128  putenv (b);
129  if (asprintf (&b, "COLUMNS=%d", cols) == -1)
130	  memory_error_and_abort("asprintf");
131  putenv (b);
132#else /* !HAVE_PUTENV */
133#  if defined (HAVE_SETENV)
134  if (asprintf(&b, "%d", lines) == -1)
135	  memory_error_and_abort("asprintf");
136  setenv ("LINES", b, 1);
137  if (asprintf (&b, "%d", cols) == -1)
138	  memory_error_and_abort("asprintf");
139  setenv ("COLUMNS", b, 1);
140#  endif /* HAVE_SETENV */
141#endif /* !HAVE_PUTENV */
142}
143
144char *
145sh_get_env_value (varname)
146     const char *varname;
147{
148  return ((char *)getenv (varname));
149}
150
151char *
152sh_get_home_dir ()
153{
154  char *home_dir;
155  struct passwd *entry;
156
157  home_dir = (char *)NULL;
158  entry = getpwuid (getuid ());
159  if (entry)
160    home_dir = entry->pw_dir;
161  return (home_dir);
162}
163
164#if !defined (O_NDELAY)
165#  if defined (FNDELAY)
166#    define O_NDELAY FNDELAY
167#  endif
168#endif
169
170int
171sh_unset_nodelay_mode (fd)
172     int fd;
173{
174  int flags, bflags;
175
176  if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
177    return -1;
178
179  bflags = 0;
180
181#ifdef O_NONBLOCK
182  bflags |= O_NONBLOCK;
183#endif
184
185#ifdef O_NDELAY
186  bflags |= O_NDELAY;
187#endif
188
189  if (flags & bflags)
190    {
191      flags &= ~bflags;
192      return (fcntl (fd, F_SETFL, flags));
193    }
194
195  return 0;
196}
197